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performance calculations for the De Haviland Gipsy Six I aircraft engine
De Haviland Gipsy Six I air-cooled 6 -cylinder inverted inline engine 200 [hp]
(149.1 KW)
introduction : August 1934 country : United Kingdom importance : ***
applications : De Havilland D.H.89 Dragon Rapide
normal rating : 200 [hp](149.1 KW) at 2350 [rpm] at 0 [m] above sea level
no reduction, direct drive, valvetrain : OHV
General information :
Small cross-sectional area gave low drag and was ideal for streamlined racing
aircraft.
fuel system : Two downdraught Claudel-Hobson A.I.48F carburettors
octane no. 70 oil system : dry sump
weight engine(s) dry : 213.0 [kg] = 1.43 [kg/KW]
bore : 118.0 [mm] stroke : 140.0 [mm]
valve inlet area : 21.3 [cm^2] one inlet and one exhaust valve in cylinder head
gasspeed at inlet valve : 39.7 [m/s]
throttle : 87 /100 open, mixture :13.0 :1
compression ratio: 5.25 :1
stroke volume (displacement) (Vs) : 9.186 [litre]
compression volume (Vc): 2.161 [litre]
total volume (Vt): 11.348 [litre]
engine height : 82 [cm]
engine length: 1.58 [m]
specific power : 16.2 [kW/litre]
torque : 606 [Nm]
engine weight/volume : 23.2 : [kg/litre]
average piston speed (Cm): 11.0 [m/s]
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intake manifold absolute pressure (MAP) at 0 [m] altitude Pi : 0.82 [kg/cm2]
compression pressure at 0 [m] altitude Pc: 6.50 [kg/cm2]
estimated combustion pressure at 0 [m] Pe : 25.98 [kg/cm2]
exhaust pressure at 0 [m] Pu : 3.22 [kg/cm^2 ]
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compression-start temperature at 0 [m] Tic: 347 [°K] (74 [°C])
compression-end temperature at 0 [m] Tc: 517 [°K] (244 [°C])
average engine wall temperature at 0 [m] : 476 [K] (202 [°C])
caloric combustion temperature at 0 [m] Tec: 2079 [°K] (1806 [°C])
mean engine pressure (M.E.P.) at 0 [m] altitude Pm : 6.46 [kg/cm2]
polytroph combustion temperature at 0 [m] Tep : 2064 [°K] (1791 [°C])
estimated combustion temperature at 0 [m] Te (T4): 2052 [°K] (1778 [°C])
polytrope expansion-end temperature at 0 [m] Tup: 1138 [°K] (864 [°C])
exhaust stroke end temperature at 0 [m] Tu: 1098 [°K] (825 [°C])
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calculations for take-off/emergency power at sea level
max rpm engine limited by max rpm prop (2400 rpm)
average piston speed : 11.2 [m/s]
gas speed at inlet valve : 40.5 [m/s]
caloric combustion temperature at sea level Tec: 2115 [°K] (1842 [°C])
emergency/take off rating at 2400 [rpm] at sea level : 206 [hp]
Thermal efficiency Nth : 0.339 [ ]
Mechanical efficiency Nm : 0.774 [ ]
Thermo-dynamic efficiency Ntd : 0.263 [ ]
design hours : 2113 [hr] time between overhaul : 928 [hr]
dispersed engine heat by cooling air : 2963.86 [Kcal/minute/m2]
required cooling surface : 4.36 [m2]
weight cooling ribs : 11.15 [kg]
fuel consumption optimum mixture at 2350.00 [rpm] at 0 [m]: 46.38 [kg/hr]
specific fuel consumption thermo-dynamic : 229 [gr/epk] = 307 [gr/kwh]
estimated specific fuel consumption (cruise power) at 0 [m] : 305 [gr/kwh]
specific fuel consumption at 0 [m] at 2350 [rpm] with mixture :13.0 :1 : 311 [gr/kwh]
specific fuel consumption (volume*rpm) at 2350 [rpm] : 409 [gr/kwh]
estimated specific oil consumption (cruise power) : 21 [gr/kwh]
Literature :
de Havilland Gipsy Six - Wikipedia
DISCLAIMER Above calculations are based on published data, they must be
regarded as indication not as facts.
Calculated performance and weight may not correspond with actual weights
and performances and are assumptions for which no responsibility can be taken.
Calculations are as accurate as possible, they can be fine-tuned when more data
is available, you are welcome to give suggestions and additional information
so we can improve our program. For copyright on drawings/photographs/
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(c) B van der Zalm 28 November 2021 contact : info.aircraftinvestigation@gmail.com python 3.7.4